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Series of events from the time the action potential reaches the persynaptic terminal to the activation of the postsynaptic receptor?
Wiki User
∙ 15y ago
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Wiki User
∙ 15y ago
After the action potential reaches the presynaptic terminal, voltage-gated calcium channels open, leading to an influx of calcium ions. This triggers the release of neurotransmitters into the synaptic cleft. These neurotransmitters then bind to receptors on the postsynaptic membrane, leading to depolarization and the generation of a new action potential in the postsynaptic neuron.
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The receptor cells that convert light energy into neural signals are called?
The receptor cells that convert light energy into neural signals are called photoreceptor cells. These cells are located in the retina of the eye and are responsible for producing electrical signals in response to light stimulation.
How nerve impulsive are transmitted from the receptor to central nervous system to effectors?
Nerve impulses are transmitted from the receptor to the central nervous system via sensory neurons. In the central nervous system, the impulse is processed and may be relayed to motor neurons that carry the impulse to effectors such as muscles or glands to produce a response. This pathway allows for communication and coordination between different parts of the body.
What is specificity theory?
Specificity theory proposes that a particular type of sensory receptor corresponds to a specific sensation. According to this theory, the quality of a sensation is determined by the specific type of sensory receptor that is activated. This theory contrasts with the pattern theory of sensory perception, which suggests that the quality of sensation is determined by the pattern of activity across different types of receptors.
The role of the myelin sheath?
The myelin sheath is a protective covering that surrounds nerve fibers and helps in efficient transmission of nerve impulses. It acts as an insulator, speeding up the transmission of signals along the nerves. Damage to the myelin sheath can result in disruptions in nerve signal transmission and lead to conditions such as multiple sclerosis.
How might the message sending process of a neuron be disrupted?
The message sending process of a neuron can be disrupted by factors such as neurotransmitter imbalances, receptor dysfunction, or damage to the axon. These disruptions can lead to communication errors within the nervous system, affecting functions like cognition, movement, and sensation.
What is the voltage change at the receptor site of a neuron?
postsynaptic potential (PSP)
Can graded potential form on receptor endings?
Yes, Graded potentials (otherwise known as postsynaptic potentials) can form on receptor endings.
Atropine acts as cholinergic agent by?
blockade of postsynaptic receptor
WhatConversion of a stimulus into a generator potential is?
Receptor potential, a type of graded potential, is the transmembrane potential difference of a sensory receptor. A receptor potential is often produced by sensory transduction. It is generally a depolarizing event resulting from inward current flow. The influx of current will often bring the membrane potential of the sensory receptor towards the threshold for triggering an action potential. A receptor potential is a form of graded potential, as is a generator potential. It arises when the receptors of a stimulus are separate cells. An example of this is in a taste bud, where taste is converted into an electrical signal sent to the brain. When stimulated the taste bud triggers the release of neurotransmitter through exocytosis of synaptic vesicles from the presynaptic membrane. The neurotransmitter molecules diffuse across the synaptic cleft to the postsynaptic membrane. A postsynaptic potential is then produced in the first order neuron, and if the stimulus is strong enough to reach threshold this may generate an action potential which may propagate along the axon into the central nervous system
Neurotransmitters bind to specific proteins on the postsynaptic membrane called?
Receptor molecules, or called receptor proteins.
Activation of which kind of receptor causes heart rate to increase?
beta-one receptor
The activation of receptor tyrosine kinases is characterized by what?
Dimerization and phosphorylation
The activation of receptor tyrosine kinases is characterized by?
dimerization and phosphorylation.
What is it when nerve impulses are interrupted and muscles don't react?
This can be caused by inhibitor molecules known as neurotoxins occupying the active sites of the receptor molecules of the postsynaptic neurone membrane, this prevents an action potential from being carried from the presynaptic neurone to the postsynaptic neurone, thus preventing the passage of a nerve impulse and consequental muscular contractions that produce an effect to stimuli
How does curare cause muscle paralysis?
Curare is a competitive inhibitor of acetylcholine. It fights with acetycholine for postsynaptic receptors.
What is difference between generator potential and receptor potential?
it is
What a neurotransmitter is?
A neurotransmitter is a chemical or peptide in synapses, usually between neurons, a neuron and muscle or a neuron and other organ. The neurotransmitter transmits information to and from and within the brain. When a neurotransmitter is released from the presynaptic cell in response to depolarization of the cell by an action potential, it diffuses across the synaptic cleft and binds a receptor or ligand-gated ion channel on the postsynaptic cell. Binding on the postsynaptic cell alters the resting potential of the postsynaptic cell in either an inhibitory or excitatory manner, making the cell less susceptible or more susceptible (respectively) to an action potential. Examples include, but are not limited to, acetylcholine, GABA, noradrenaline, serotonin and dopamine.
